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Zirconia sintered body

A technology of zirconia and sintered bodies, applied in dental prosthesis, chemical instruments and methods, dentistry, etc., can solve the problems of long processing time and low aesthetics of preforms, and achieve shortened processing time, excellent aesthetics, and reduced The effect of the amount of cutting

Pending Publication Date: 2021-07-23
KURARAY NORITAKE DENTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the processing time for obtaining the preform is long, and there is also a problem of poor aesthetics due to the single-layer structure

Method used

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  • Zirconia sintered body
  • Zirconia sintered body
  • Zirconia sintered body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1~2 and comparative example 1

[0135] The zirconia calcined body and the sintered body of each example and comparative example were produced according to the following procedure.

[0136] The method for producing the raw material powder will be described. First, a mixture was prepared using monoclinic zirconia powder and yttrium oxide powder (the yttrium oxide content rate was 4 mol%). Next, this mixture was added to water to prepare a slurry, which was wet pulverized and mixed with a ball mill until the average particle diameter became 0.13 μm or less. The pulverized slurry was dried by spray drying, and the obtained powder was calcined at 1000° C. for 2 hours to prepare a powder (primary powder). Through the raw material in the spray drying machine, the powder is processed until the content of the specification is achieved.

[0137] The obtained primary powder was divided into four as the first to fourth powders, and a pigment was added to each powder so as to have the content shown in Table 1 (the cont...

Embodiment 3

[0143] Set the shape of the base to Figure 1D A zirconia calcined body and a sintered body were fabricated in the same manner as in Example 1 except for the shape obtained by combining the rectangle and the semicircle shown.

[0144] [Confirmation of deformation of zirconia sintered body]

[0145] The zirconia sintered body produced by the aforementioned method was processed into Figure 3A , Figure 3B , Figure 4A , Figure 4B , Figure 5A and Figure 5B The shape shown (however, the dimensions described in these drawings are the values ​​after sintering). The processed zirconia calcined body was calcined at 1550° C. for 120 minutes to produce a zirconia sintered body. The zirconia sintered bodies of Examples 1-2 are shown in Figure 3A , Figure 3B , Figure 4A ,and Figure 4B , the bottom surface diagram of the zirconia sintered body of Example 3 is shown in Figure 1D , the zirconia sintered body of Comparative Example 1 is shown in Figure 5A and Figure 5...

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Abstract

The present invention provides a zirconia sintered body with which it is possible to shorten the processing time by reducing the amount of an excess portion to be removed when a prosthetic appliance is machined from the zirconia sintered body, to extend the durability of processing equipment, and to shorten the time for treatment of a patient, and which undergoes little deformation and provides a high aesthetic value. The present invention pertains to a columnar-shaped zirconia sintered body that has a bottom face and a lateral face, wherein the bottom face has an outer shape that is neither square-shaped nor rectangle-shaped but that has at least one straight portion.

Description

technical field [0001] The present invention relates to a zirconia sintered body. Furthermore, the present invention relates to a dental restoration comprising a zirconia sintered body, and a zirconia precalcined body. Background technique [0002] In recent years, as dental products, ceramic materials such as zirconia (zirconia) have been used instead of metals from the viewpoint of aesthetics and safety. In particular, zirconia is excellent in strength and aesthetics, and therefore its demand has increased as prices have decreased in recent years. [0003] A zirconia precalcined body is used when dental products such as dentures, crown prostheses, and bridges are chipped by CAD / CAM. This zirconia calcined body is formed into a rectangular parallelepiped. When cutting out dental products such as dentures, crown prostheses, and bridges from the zirconia precalcined body, machining treatment is performed from the peripheral surface of the zirconia precalcined body by a mac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61C13/08A61C13/083A61C5/70
CPCA61C5/70A61C13/083A61C13/08A61C8/0012A61C13/081A61C13/0022A61K6/818C04B35/486B32B18/00C04B2237/348C04B2237/64C04B2235/945C04B2237/78C04B2237/80C04B2235/95C04B2235/9661C04B2235/3225C04B2235/3246C04B2235/5445C04B35/62655C04B2235/3279C04B2235/3239C04B2235/604C04B2235/661C04B2237/704C04B2237/58C04B2237/66C04B2235/6562C04B35/64C04B2111/00836
Inventor 原田进司山田芳久
Owner KURARAY NORITAKE DENTAL
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